He has missed all season while recovering from left knee surgery and was scheduled to fly to Las Vegas on Saturday before experiencing back spasms during the Rangers' 6-3 loss to the Royals on Friday night. Holland wasn't feeling any better Saturday and will stay in Arlington to get treatment.

"We'll see how long it takes," Rangers manager Ron Washington said. "If the doctor gives him clearance, he'll still be able to get a start. If not, he's going to have to adjust. But we'll just go day to day and see."

Holland's first rehab start came July 30 in Frisco, when the 30-day period allowed for pitchers rehabbing in the Minors began. That period ends Aug. 28, although the Rangers could also call him up when the big league roster expands to 40 players Sept. 1.

Christian Corona is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.